The effect of technological factors on the density and strength of sintered refractory metals

Summary

• 1. The optimum compacting pressures for niobium and molybdenum are 4000–6000 daN/cm².

• 2. The maximum compact density is secured under the following sintering conditions:

• a) for molybdenum: temperature 2173°K, isothermal holding for 4–5 h, environment-hydrogen;

• b) for niobium: temperature 2173°K, isothermal holding for 3–4 h, vacuum of 0.133 N/m²(l ·10⁻³mmHg).

• 3. Molybdenum and, particularly, niobium show little tendency to strength loss in the temperature range 293-1473°K.